Thermoskin Knee Wrap Universal is ideal for arthritis. This knee support is designed with an adjustable velcro wrap to allow for greater comfort of fit and ease of use. The adjustable velcro allows compression variation for swollen and/or fluid on the knee. Thermoskin Thermal Supports utilize the exclusive patented Trioxon lining that is clinically proven to capture your natural body heat. Unlike other products, Trioxon allows your skin to ventilate and remain comfortably dry even with long-term use. Competitive products trap the perspiration resulting in discomfort, slippage, risk of infection and unpleasant odor. The Trioxon lining creates a microclimate to help the skin breathe while still providing effective heat therapy. This is the secret of Thermoskin's long-term comfort for the user. You can even wear Thermoskin for extended periods of time without the discomfort you would have with other products.